State lambda return types explicitly when multiple returns exist.

This is easier to read than casting nullptr to the desired type.

Change-Id: I19eb85f96dc4e66316e36c1839b8df25f39fa608
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/310178
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed